Find the efficiency of a machine that does 900 J of work if the input work is 1,200 J. You must show all your work to receive credit. A wheelbarrow can be used to help lift a load and push the load across a distance. The fulcrum is located at the opposite end where the effort is applied and the load (whatever is in the wheelbarrow) is in the middle of the fulcrum and effort.

What kind of lever is the wheelbarrow.

A. Class 1 Lever - The fulcrum is located between the effort and the load.
B. Class 2 Lever - The closer the load is placed to the fulcrum, the less effort needed to lift the load.
C. Class 3 Lever - The effort lies between the load and the fulcrum.

How does a machine make work easier? A machine makes work easier by changing. Choose the three statements that apply.

the direction of a force
the amount of force applied
the time needed to do the work
the amount of work done
the distance over which a force is applied

Adam lifts a book from the floor, carries it across the room, and places it on a high shelf. When is Adam doing work on the book?

W= FD
Work = Force x Distance
A. He does work from the moment he touches the book until he lets it go.
B. He does work only while he carries the book across the room.
C. He does work as he picks up the book and as he lifts it to the shelf.
D. He does work on the book at no time during this process.

Two girls each carry a box up to the fourth floor of a building. The total mass of each girl and the box she is carrying is the same. Rachel makes the trip in 35 seconds while Madison takes 50 seconds.

Which of the following statements best describes this task?
A. Madison does more total work than Rachel.
B. Rachel has greater power output than Madison.
C. Rachel does more total work than Madison.
D, Madison has a greater power output than Rachel.

please don't steal my points if you can't answer it thx for trying